What is the LATCH SYSTEM in automobiles. Used for Child Safetly. http://ping.fm/jHhhk
- LATCH, which stands for “Lower Anchors and Tethers for CHildren”, is designed to make proper car seat installation easier.
- LATCH is standard in all cars manufactured after September 1, 2002, and eliminates the need for the use of passenger seatbelts to secure the car seats.
- The LATCH system has two permanent anchors at the base of vehicle’s rear seats and a top anchor behind each seating position in all vehicles. These anchors are specifically designed for car seat tethers and hooks.
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A great question. “What is Traction Control?”
When it comes to buying a vehicle safty is usually the #1 consideration in the purchase process. I know it is for me. A car can be one that I have always dreamed about owning, and the dealership can have a sale of the century. But if this car does not come with the safty features that will protect me and my family out on the road, “It’s a paper wait”.
So, what is “Traction Control”?
A traction control system (TCS), also known as Anti-Slip Regulation (ASR), is typically (but not necessarily) an electro-hydraulic system on production vehicles designed to prevent loss of traction of the driven road wheels, and therefore maintain the control of the vehicle when excessive throttle is applied by the driver and the condition of the road surface (due to varying factors) is unable to cope with the torque applied. Although similar to electronic stability control (ESC) systems, traction control systems do not have the same goal.
The intervention can consist of one or more of the following:
- Retard or suppress the spark to one or more cylinders
- Reduce fuel supply to one or more cylinders
- Brake one or more wheels
- Close the throttle, if the vehicle is fitted with drive by wire throttle
- In turbo-charged vehicles, the boost control solenoid can be actuated to reduce boost and therefore engine power.
Typically, the traction control system shares the electro-hydraulic brake actuator (but does not use the conventional master cylinder and servo), and the wheel speed sensors with the anti-lock braking system.
Watch this video to see Traction Control Demo.
The predecessor of modern electronic traction control systems can be found in high-torque, high-power rear-wheel drive cars as a limited slip differential. Limited slip differential is a purely mechanical system that transfers a relatively small amount of power to the non-slipping wheel, it still allows some wheel spin to occur.
In 1971 the Buick division of GM introduced MaxTrac, which used an early computer system to detect rear wheel spin and modulate engine power to those wheels to provide the most traction. A Buick-exclusive at the time, it was an option on all full-size models, including the Riviera, Estate Wagon, Electra 225, Centurion, and popular LeSabre family sedan. Cadillac also introduced the ill fated Traction Monitoring System (TMS) in 1979 on the redesigned Eldorado. It was criticized for its slow reaction time and extremely high failure rate.
The basic idea behind the need of a traction control system is the difference between the slips of different wheels or an apparent loss of road grip that may result in loss of steering control over the vehicle. Difference in slip may occur due to turning of a vehicle or differently varying road conditions for different wheels. At high speeds, when a car tends to turn, its outer and inner wheels are subjected to different speed of rotation, that is conventionally controlled by using a differential. A further enhancement of the differential is to employ an active differential that can vary the amount of power being delivered to outer and inner wheels according to the need (for example, if, while turning right, outward slip (equivalently saying, ‘yaw’) is sensed, active differential may deliver more power to the outer wheel, so as to minimize the yaw (that is basically the degree to which the front and rear wheels of a car are out of line.) Active-differential, in turn, is controlled by an assembly of electromechanical sensors collaborating with a traction control unit.
Use of traction control
- In road cars: Traction control has traditionally been a safety feature in high-performance cars, which would otherwise need very sensitive throttle input to keep them from spinning the driven wheels when accelerating, especially in wet, icy or snowy conditions. In recent years, traction control systems have become widely available in non-performance cars, minivans, and light trucks.
- In race cars: Traction control is used as a performance enhancement, allowing maximum traction under acceleration without wheel spin. When accelerating out of turn, it keeps the tires at the optimum slip ratio.
- In motorcycles: Traction control for a production motorcycle was first available with the Honda ST1100 in 1992. By 2009, traction control was an option for several models offered by BMW and Ducati, and the model year 2010 Kawasaki Concours 14 (1400GTR).
- In off road vehicles: Traction control is used instead or in addition to the mechanical limited slip or locking differential. It is often implemented with an electronic limited slip differential, as well as other computerized controls of the engine and transmission. The spinning wheel is slowed down with short applications of brakes, diverting more torque to the non-spinning wheel. This form of traction control has an advantage over a locking differential, as steering and control of a vehicle is easier, so the system can be continuously enabled. It also creates less stress on the drivetrain, which is particularly important to the vehicles with an independent suspension that is generally weaker compared to solid axles. On the other hand, only half of the available torque will be applied to a wheel with traction, compared to a locked differential, and handling is less predictable.
Traction control in cornering
Traction control is not just used for moving a vehicle from stationary without slippage. During hard maneuvers in a front-wheel drive car, there is a point where the wheels cannot both steer and drive the car at the same time without losing traction. With traction control, it is less likely for this loss of control to occur. There is a limit though, when the tires lose grip. If the car does not corner as sharply as indicated by the front wheels, understeer occurs. In rear wheel drive cars, traction control can prevent oversteer.
Automobile manufacturers state in vehicle manuals that traction control systems should not encourage dangerous driving or encourage driving in conditions beyond the drivers’ control
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Hello, my name is Kevin Klocke. My parents, Merrill and Pat Klocke recently had work on their Nissan Maxima performed at your Dealership. I personally want to thank Mr. Jim Fretwell for everything he has done for my parents. Mr. Fretwell, treated my parents with the utmost respect and proffesionalism, during the repairs. Unfortunatelly, these days this is hard to find and allot of people have a pre-conceived opinion of car repair businesses and people, that is not favorable in some cases. Mr. Fretwell went above and beyond to make sure my parents were treated fairly, and with respec, andt that is usually not found these days. For that, I would like this message to make sure it gets to both Mr. Fretwell, and his superiors. I thank you and would like to say that because of people like Mr. Fretwell in the business, with his respect and profesionalism, this goes a long way in giving your Dealership a great name in the industry. As a matter of fact, they liked his service so much, they bought a different car! Once again, please be sure to pass this information along and make sure he gets this message. Thank You, Kevin Klocke
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